Online 10th CLASS NCERT Practice CHEMISTRY Tests for Chapters => 1, 2, 3, 4
Chemistry Test
Time:1 hour 30 min Marks:
35
Q.1 A solution of a substance ‘X’ is used for white
washing. 3
(i)
Name the substance ‘X’ and write its formula.
(ii)
Write the reaction of the substance ‘X’ named in (i) above with
water.
Q.2 Write the balanced chemical
equations for the following reactions. 2
(a) Calcium hydroxide +
Carbon dioxide => Calcium carbonate + Water
(b) Zinc + Silver nitrate => Zinc nitrate + Silver
Q.3 A shiny brown coloured element ‘X’ on heating in air becomes
black in colour. 1
Name the element ‘X’ and
the black coloured compound formed.
Q.4 Which
gas is usually liberated when an acid reacts with a metal? Illustrate with an
example. How will you test for the presence of this gas? 3
Q.5 How
is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?2
Q.6 Plaster of Paris should be
stored in a moisture-proof container. Explain why? 2
Q.7 Give two important uses of
washing soda and baking soda. 2
Q.8 Which gas is produced when dilute hydrochloric acid is added
to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4. 2
Q.9 Name two metals which are found in nature in the free state. 2
Q.10 What are amphoteric oxides? Give two examples of
amphoteric oxides. 2
Q.11 You
must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.
Explain why these sour substances are effective in cleaning the vessels. 2
Q.12 Differentiate between metal and non-metal on the basis of
their chemical properties. 2
Q.13 Draw the structures for the following compounds. 5
(i)
Ethanoic acid (ii)
Bromopentane* (iii) Butanone (iv) Hexanal.
*Are structural isomers possible for
bromopentane?
Q.14 A mixture of oxygen and
ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is
not used? 2
Q.15 How can ethanol and ethanoic acid be differentiated on the
basis of their physical
and
chemical properties? 3
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